Head-stock.



B. M. W. HANSON.

HEAD STOCK.

. APPLICATION FILED JAN. 10, I916- 170, Patented May 9,1916.

9 2 SHEETS-SHEET I.

THE COLUMBIA PLANDCIRAPH 0., WASHINGTON, n. c.

B. M. W. HANSON.

HEAD STOCK.

APPLICATION FILED JAN. I0, I916.

Patented May 9,1916.

2 SHEETS-SHEET 2.

THE COLUMBIA PLANOGRAPH co" WASHINGTON. D. C.

BENGT M. w. HANSON, or HARTFORD, NNECTICUT, assIcTNon o PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION on NEW JERSEY.

HEAD-STOCK.

Specification of Letters Patent.

Patented May a, 1916.

Application filed January 10, 1916. Serial NO. 71,317.

To all whom it may concern Be it known that I, BENGT M. IV. I-L N- soN, a citizen of the United States, residing at Hartford, in the ounty of Hartford and,

State of Connecticut, have invented certain new and useful Improvements in Head- Stocks, of which the following is a specification.

This invention relates to head-stocks.

A headstock involving my invention is,

susceptible of advantageous use in conjunction with or as part of a metal working machine of any suitable kind, :a specific example of which is a lathe.

One of the primary purposes of the in vention is the provision of means by which the work can be readily mounted in coijperative relation with the headstock and properly and correctly driven with the spindle.

In the drawings accompanying and forming part of the present specification I have shown in detail one form of embodiment of the invention which to enable those skilled in the art to practice the same will be set forth fully in the following description. I do not restrict myself to said disclosure; I may depart therefrom in several respects within the scope of the invention defined by the claims following said description.

Referring to said drawings: Figure 1 is a side elevation partly in section of a headstock involving the invention. F ig.2 is an elevation of certain of the operative parts of the headstock removed from the supporting structure, the spindle being broken away. Fig. 3 is a detail view in sectional elevation of a portion of the spindle, the

endwise-movable rod, and the levers for advancing the rod.

Like characters refer to like parts throughout the several Views.

As already noted, a head-stock compris ing the invention is susceptible of incorporation with utility in various types of metal working machines. In Fig. 1 the numeral 2 is assumed to represent in part the bed of a lathe carrying the head-stock, the body 3 of which may as is usual in machines of the art, be adjustable longitudinally of the bed 2. This body 3 is, however, normally fixed or relatively stationary. At-the inner end of the body 8 is a bearing 4:, while at the rear or outer end is a practically similar bearing.

5, the two bearings presenting a convenient supporting means for the rotary splndle 6.

The forward or inner end of the spindle is shown provided with a fork '7, the branches of which are Connected by a bridge-piece 8 having the center 9, the cone-pointed end of which is adapted to fit a depression in the work 10. It will, therefore, be clear that the center 9 rotates with the spindle 6.

The spindle 6 carries between the bearings 4c and 5 the pulleys 11 and 12, loose on and tight with respect to the spindle. l/Vhen a driving belt (not hown) is on the pulley 12, it will be clear that the spindle 6 and therefore the center 9 will be rotated, whereas if the belt be shifted to the pulley 11, the rotation of the spindle will be arrested. WVhile the pulley 11 is actually carried by the spindle 6, it is not in the present case directly supported thereby, a bushing fitting in the pulley and surrounding the spindle as common in this art.

In conjunction with the spindle 6 and center 9 or equivalents, I provide means for driving the work, the driving means being rotative with" the spindle. hereinafter more particularly appear driving means of novel construction. Between the branches of the forked head 7 are mounted jaw members as 13 and 14:. As shown these jaw members are pivotally mounted between their ends, being approximately diametrically opposite each other and being pivoted as at 15 between the sides of the fork or slotted head 7 The pivots 15 are so positioned that each of the jaw memhere 13 and lwill have a long and a short arm, the gripping or work engaging portions of the jaw members 13 and 14: being on the short arms-thereof and being made in the form of concaved seats. o

I provide means for setting the jaw meme bers l3 and 14L in such manner that said aw members will engage the work with equal pressure, a floating equalizing member as 16 answering satisfactorily in this connection. This floating member 16 may as shown consist of an elongated bar positioned be I provide as will mally open or spread apart the work-en gaging arms of said jaw members. The equalizing member 16 may be operated in any desirable manner for instance by the rod 19 which acts against said equalizing member practically midway of the length thereof, the latter as shown having a socket in its rear side to receive the front end of the rod 19. Said rod 19 extends lengthwise of and along the longitudinal bore of the hollow spindle 6 and as shown has the oppositefins or wings 21 projectingthrough diametrically opposite slots 22 formed in said spindle and intersecting the bore thereof, these'wings or finspresenting a convenient way of keying the rod and spindle together. a The wings also present suitable projections to be engaged by levers or equivalent means (hereinafter described) by which the rod .19 and hence the actuating equalizing member 16 can be advanced to set the two jaw members 13 and 1 1.

Threaded onto the extreme outer end of shaped portion 26 thereof constitutes a suitable actuator for the levers 24:, the free por tions of the long arms of the levers constantly lying against the cone surface or portion 26. Supported for sliding movement by the, rear bearing 5 is the bar 27 having a finger 28 disposed in the peripheral groove 29 of the slidable cone sleeve 25. This bar presents a suitable means for operating said" cone sleeve. To move the bar back and forth to effect the gripping or releasing movements of the jaw members 13 and 1 1' through the intervening parts, the lever 30'may be provided, this lever 30 being pivoted as at 31to the bracket 32 on the bearing 5 and the inner arm extending through a slot 33 in said bearing and entering a slot 34 in the slidable bar 27 between the ends thereof.

It follows that if the forward or manipulating arm ofthe lever 30 be swung to the right in Figs. 1 and 2, it imparts an opposite movement to the bar 27, so that the latter in turn can through the intermediate parts close the V jaw members 13 and 14 upon the work 10. It will be understood that the front end of' the rod 19 projects slightly beyond the forward end of the bore or longitudinally eX I tending passage of the spindle 6. This rod 19 except where it is enlarged as at 19 is free of the wall of the bore, the enlargement 19 being back of the front end of the rod, the'forward portion therefore, of the rod being susceptible of a certain amount of with the wall of said bore, the rod 19 will be I accurately guided.

It will be assumed that the free ends of the levers 24 are 'upon a low part of the cone surface 26, that the lever 30,'bar 27, rod 19 and equalizing number 16 are in their retractive positions. It follows, therefore, that the two springs 18 acting against the jaw members l3 and 1% will yieldingly hold said jaw members in their expanded or open relation, so that the work 10 can be positioned on the center 9. It will be assumed that the work isthus located and that it is desired to clamp the same. In this event the outer or manipulating arm of the lever 30 is advanced or swung toward the right in Figs. 1 and 2, the bar 27 being moved to the left and correspondingly moving the sleeve 27 so that the free portions of the levers 24 will be caused to ride up the cone surface 26, the toes of the levers acting against the wings 21 advancing the rod 19 or moving the same toward the right in Figs. 1 and 2, thereby imparting a corresponding movement to the equalizing or rocking member 16. As the equalizing member is thus moved forward it acts against the aw members 1 1 so as to set the same with identical pressures upon'the work 10, the result being that there isno possibility of the work being thrown'off center, although it will be properly driven. In Figs;

1 and 2 the arts are shown as occu) in their advanced or operative positions.

In Fig. 1 the casing 35 incloses change gearing for driving a cam shaft (not shown). These features constitute no part of the present case. Above'the slidable bar 27 is a belt shifting member 36 provided with a loop 37 to receive the belt movable between'the pulleys 11 and 12. shifting member 36 is also equipped with a brake member 38 adapted to engage the fast pulley 12 just about the time thebelt is shifted 1 from said fast pulley on the loose pulleyll. This belt shifter 36 can be operated by the hand lever 39 or can be operated mechanr cally by the element 40. Thebelt shifting and pulley brake means, however, constitute no part of the present application.

It will be clear from theforegoing description taken in connection with the an-' neXed drawings, that I provide a live'spindle and means rotative with the spindle for driving the work and automatically adjustable to the form of the work. The automatically "adjustable means consists as shown of a pair of j aw= members which are made thus automatically adjustable through the intervention of a floating or bodily movable member. It will be assumed that the rod 19 and-floating or equalizing II16I11- This belt her 16 are in the back positions and that as a consequence the jaw members 13 and 14 are open and that a piece of work as 10 is mounted on the center 9. It will be further supposed that that part of the work which is to be gripped by the aw members when the same are closed is eccentric, for instance on the upper side thereof. To grip or chuck and therefore effect the driving of the work when the spindle 6 is rotated, the rod 19 is thrust forward in the manner already described, consequently imparting a corresponding movement to the floating or equalizing member 16. As the latter is advanced, it acts against the rounded free ends of the jaw members and tends to set them. If as in the illustration noted the upper part of the work be eccentric, the jaw member l i will first engage the work, after which the floating member 16 will in the present case tip and then move the lower jaw member 13 into engagement with what is supposed to'be the cylindrical portion of the work and without the upper jaw applying a thrust to the work in a direction tending to displace the same laterally or to move it off center. 'When both jaws engage the work and on the continued forward movement of the rod 19, said rod acting against the floating or equalizing member 16 causes the latter, after the Work is engaged by the aw members, to impart equal thrusts to the jaw members, so that on the final setting operation the two jaws exactly balance each other, in view of which the work cannot be moved off center. That is to say if one jaw member meets or engages the work before the other owing to the eccentricity of said work, further closing movement of the jaw member in question will be arrested by the work, the pressure of the jaw member being insuflicient to displace the work. Beyond this point the thrust of the equalizing member 16 is applied solely to the companion jaw memher until such point as the latter engages the work at which time as already noted, identical closing effects will be applied to the two jaw members, in view of which circumstance displacement oif' center of the work is effectually prevented.

What I claim is:

1. The combination of a live spindle, work gripping jaw members supported by the live spindle, a rod in the live spindle, a floating member between the rod and the jaw members, and means to advance the rod and thereby the floating member to set the jaw members.

2. The combination of a live spindle, a pair of pivotally supported, approximately diametrically opposite jaw members carried by the spindle, an endwise movable rod supported by the spindle, a floating member between the rod and the jaw members, and means for advancing the rod and thereby the floating member to effect the setting of the aw members.

3. The combination of a hollow live spindle having a fork at the front end, jaw members pivotally supported by the fork, a floating member in the fork, engaging the free ends of the jaw members, a rod in the spindle engaging the floating member, and means for advancing the rod and therefore the floating member to effect the setting of the jaw members,

at. The combination of a live spindle, jaw members supported by the live spindle for rotation therewith, a floating member engaging the jaw members, an endwise movable rod in the spindle, provided with pro jections, the spindle being slotted for the passage of the projections, levers to engage the projections, and a cone sleeve slidable on the spindle for operating against the leversto cause the same through said projections to impart an advancing movement to said rod.

5. The combination of a live spindle,

' work gripping jaw members of angular form pivotally supported approximately at their angles and diametrically oppositeeach other, one branch of each jaw member being adapted to engage the work, a floating member to engage the other branches of the jaw members, and means for imparting a jaw member setting movement to said floating member.

6. The combination of a live spindle, work gripping j aw members rotative with said spindle, a floating member for setting the jaw members, and means inclosed by the spindle for operating the floating member to effect the setting of the jaw members.

I In testimony whereof I alfix my signature in presence of two witnesses.

BENGT M. w. Hanson.

WVitnesses W, M. SToRRs, G. M. GELLERT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

